Bladder-type syringe

Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...

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A61M 100

Patent

active

045739773

ABSTRACT:
The present invention is a bladder-type syringe which a user employs to collect blood samples or deliver prefilled medications or function as a passive indicator of balloon or cuff inflation on balloon-tipped catheter or endotracheal tubes. The bladder-type syringe includes an elongated bladder and a hypodermic needle. The elongated bladder is formed out of a high gas-diffusion barrier film and has an open end and a closed end. The hypodermic needle, which the user employs to penetrate into a blood vessel, has a sharp distal end and a blunt proximal end. A coupling device fixedly, but detachably, and fluidly couples the elongated bladder at its open end to the hypodermic needle at its blunt proximal end which extends into the coupling device to reduce its dead space. The bladder-type syringe also includes an elongated member having a first end and a second end and also having a flat surface with a keeper slot at its first end. The elongated bladder is fixedly, but detachably, coupled to the keeper slot. The user is able to support the elongated bladder and isolate any air bubbles contained in the elongated bladder. The coupling device is mechanically coupled to the elongated member at its second end so that the elongated bladder is suspended above the flat surface of the elongated member. The elongated bladder has longitudinal convolutions whereby the amount of gas contained within the elongated bladder is minimized when the elongated bladder is empty.

REFERENCES:
patent: 401950 (1889-04-01), Haussmann
patent: 2781951 (1957-02-01), Hanford
patent: 2907326 (1959-10-01), Gerarde
patent: 3867923 (1975-02-01), West
patent: 4410323 (1983-10-01), Hodosh et al.

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